(a) Colloidal antimony → Used in treatment of Kala-azar → (III) (b) Argyrol (colloidal silver) → Used as an eye lotion → (I) (c) Colloidal gold → Used for intramuscular injections (tonic for nervous disorders) → (II) (d) Milk of magnesia → Used for stomach disorders (antacid/laxative) → (IV)
